What Is A Hydraulic Clutch? – Parts, Working, Application, Diagram

Discover the concept, diagram, and difference between hydraulic and normal clutches. Learn about the function, working principle, advantages and disadvantages of hydraulic clutches

What Is A Hydraulic Clutch?

What Is A Hydraulic Clutch
Hydraulic Clutch Diagram

A hydraulic clutch is a type of clutch that uses a hydraulic system to transfer force from the clutch pedal to the clutch mechanism. This system uses a master cylinder, which is connected to the clutch pedal, and a slave cylinder, which is connected to the clutch mechanism.

When the clutch pedal is pressed, it pushes fluid through the system, which in turn causes the slave cylinder to move and disengage the clutch. This allows the driver to change gears smoothly and with less effort than a manual clutch.

How Hydraulic clutch Is Different From Normal Clutches?

Hydraulic clutch works on the principle of highly pressurized clutch fluid. Compared to the cable in the mechanical clutch, it consists of a fluid reservoir, a master cylinder, and a slave cylinder. Due to the presence of a master cylinder and slave cylinder, they are easier to modulate and have a more consistent lever bridge.

Hydraulic force in the fluid is used instead of a cable to obtain a smooth and consistent springer clutch pedal. In the case of the hydraulic clutch, the clutch pedal returns to its original state even after the clutch plates are damaged. But in the case of a mechanical cable clutch, the wires or cables used to activate can break or malfunction after aging.

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Function Of Hydraulic Clutch

  1. To produce or interrupt the power flow between the transmission (powered shaft) and the engine (driver shaft).
  2. To protect the transmission and engine from overloading and self-lubricating systems.
  3. It is possible to drive easily from a halt.
  4. Using the force of hydraulic fluid to connect and remove the clutch.
  5. To adjust the height of the clutch pedal itself using the same hydraulic mechanism as the braking system and to maintain the collision point of the clutch at the same point throughout the lifetime of the clutch.
  6. Place a closed system between the master cylinder and the slave cylinder and there is no air inside.
  7. The clutch master cylinder should act according to the force generated by the clutch pedal action.
  8. The hydraulic pipe should move the pressurized fluid between the cylinders without any leakage, as this can trap the air in the system and affect the clutch mechanism.
  9. The clutch engagement mechanism should be optimal when the pedal is released so that the attachment between the plates and the flywheel remains stable and the clutch plate does not deteriorate.

Parts Of The Hydraulic Clutch

Working Principle Of Hydraulic Clutch
Parts Of The Hydraulic Clutch

1. Clutch Pedal – The clutch pedal is the primary part that attaches the clutch to a vehicle. The clutch disengagement process begins when the driver presses the clutch pedal.

2. Master Cylinder– As the name suggests, it is a primary hydraulic cylinder in which clutch fluid is applied at high pressure with the help of pistons present inside the cylinder. The clutch fluid reservoir is connected to the master cylinder which supplies the clutch fluid when the clutch pedal is pressed.

3. Pressure Pipe – It supplies fluids from the master cylinder to the slave cylinder at high pressure to operate the clutch.

4. Slave Cylinder – The slave cylinder is the second hydraulic cylinder present in the system. It consists of a push piston rod that is attached to the clutch release fork. The liquid from the master cylinder enters the slave cylinder and presses against the push piston rod which in turn executes the release fork.

5. Release Fork – The clutch release fork is attached to the slave cylinder at one end and the other end is connected to the clutch shaft to which the clutch release bearing is attached. When the clutch pedal is pressed, it is used to press the release bearings to put pressure on the diaphragm.

6. Release Bearing – Clutch release bearings are mounted on the clutch shaft. When the clutch pedal is pressed it presses the diaphragm in the middle of the spring.

7. Diaphragm Spring – The diaphragm is a semi-circular or ‘C’ shaped spring. It is applied to the pressure plate and is used to maintain pressure on the clutch plate. When the clutch pedal is pressed, the diaphragm is pushed into the middle of the spring and the spring pulls the pressure plate away from the clutch plate.

8. Pressure Plate – The purpose of the pressure plate is to push the friction plate against the discus. It is placed under pressure with the help of a diaphragm spring. When the clutch pedal is pressed, the diaphragm spring pressure plate pulls away from the clutch plate, separating the engine from the transmission.

9. Splined Sleeves – The split sleeves are located between the friction lining of the clutch plate and the pressure plate. The pressure plate keeps the split sleeves under pressure to keep the clutch connected. When the pressure plate releases pressure the split sleeve goes away and it separates the engine from the transmission.

10. Clutch Plate – The clutch plate is placed between the pressure plate and the flywheel. It has an abrasive lining on both sides of its surface. The friction surface creates friction between the discus and the pressure plate. The friction between them is responsible for generating or interrupting the flow of electricity between the engine and the transmission.

11. Flywheel – The wheel is a part that is connected to the engine crankshaft at one end and the clutch plate at the other end. The disc is responsible for transferring the flow of electricity from the engine to the transmission through the clutch plate. When the clutch pedal is pressed, the linkage between the flywheel and the clutch plate is interrupted. This causes the inability of power transfer and allows the gear to change smoothly.

Working Of Hydraulic Clutch

Working Of Hydraulic Clutch
Working Of Hydraulic Clutch

1. Engagement Of Clutch

The clutch is turned on when electricity flows between the engine and the transmission. This happens when the driver leaves the clutch pedal after changing gears. The release of the clutch pedal releases the fluid into the cylinder. This fork, bearing and diaphragm bring spring back to their original location.

As soon as the diaphragm returns to its original position, the splint sleeves move to the original position to bring the pressure plate in contact with the clutch plate. The pressure plate presses the clutch plate against the disc causing friction. This causes the plates to rotate at the same speed along the wheel. Thus there is a flow of electricity between the engine and the transmission.

2. Disengagement Of Clutch

When the engine and transmission are rotating together, the clutch remains. In simple terms, a clutch is attached when the Flywheel and the clutch plate are rotating together under pressure at the same speed. The transmission needs to be separated from the engine to change gears smoothly. This process is called clutch disengagement. The disengagement process begins when the driver presses the clutch pedal.

The clutch pedal is attached to the master cylinder. The purpose of the master cylinder is to compress the fluid present in the reservoir under high pressure using the piston present inside it. This highly pressurized fluid is transferred from the master cylinder to the slave cylinder using hydraulic pipes.

Due to the high-pressure fluid from the master cylinder, the slave cylinder pushes out the push piston rod present inside it. The push piston rod executes the clutch release fork, which is attached to the clutch shaft. This pushes the clutch release bearings mounted on the clutch shaft.

The clutch release bearing is attached to the middle of the diaphragm spring. The diaphragm is used to contract and extend its surface on the spring pressure plate. When the release fork pushes the release effect, the middle pressure of the diaphragm pulls the plate away.

Due to the pressure plate, the split sleeves are removed and it releases pressure on the clutch plate. This leads to the loss of frictional force between the clutch plate and the disc. Since the flow of electricity is due to friction, it is interrupted when there is no frictional relationship between the plates and the flywheel. Therefore, the clutch falls apart and allows the gear to be changed.

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Advantages Of Hydraulic Clutch

  1. Hydraulic clutches provide smoother and more consistent lever bridges. It takes less time to react and does not require more force from the driver in the case of mechanical clutches.
  2. A hydraulic clutch is considered a low-friction clutch because work is done using fluid.
  3. Less maintenance is required as these are self-lubricants and have less friction.
  4. The height of the clutch pedal is self-adjusted due to hydraulic action and, therefore, it does not require periodic adjustments like a mechanical cable clutch.
  5. In addition, due to the hydraulic system, no cable is present inside the system, which may require periodic maintenance due to damage.
  6. Hydraulic clutches have higher longevity because friction is low and does not cause sudden cable breakdown like a mechanical cable-activated clutch.
  7. The quality of hydraulic clutches is higher than that of mechanical clutches.

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Disadvantages Of Hydraulic Clutch

  1. The hydraulic clutch consists of pipes and there are several parts in the system that require a very large area.
  2. The major problem that occurs in the hydraulic clutch is leakage as the clutch fluid is transferred in large quantities inside the system.
  3. The slave cylinder sometimes drains out the fluid due to hydraulic error, which can damage the clutch plate.
  4. The hydraulic pipe in the system contains plastic to metal, which will rot after a certain period of use. Therefore, it needs to be checked from time to time to avoid any major damage.
  5. After a certain time of use, the clutch fluid becomes contaminated with impurities. In addition, parts need to maintain an optimal level of fluid in the reservoir to avoid damage. Therefore, periodic change in a fluid is necessary for functioning.
  6. The clutch fluid needs bleeding to avoid trapped air during the replacement process, which is time-consuming.
  7. Standard clutch fluid should be used in the system. Incorrect fluids can damage the seal in the system.
  8. A hydraulic clutch is a complex system compared to a mechanical clutch. The hydraulic clutch is based on a master cylinder, slave cylinder, hydraulic pipe, and fluid, while the mechanical clutch requires only one cable wire to operate.
  9. The Clutch fluid used in the hydraulic clutch is expensive compared to mechanical cable wire. Cable wire is also easy to install and maintain.
  10. If the seal of the cylinder leaks then the hydraulic clutch can be expensive as the whole system will need to be replaced.

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Applications Of A Hydraulic Clutch

  1. Hydraulic clutches are preferred by reputed auto manufacturers as they insure quality and bear lower trouble.
  2. These are also used in heavy vehicles currently.
  3. Hydraulic plates can be used in both single-plate and multi-plate clutches.
  4. The self-adjusting and self-lubricating features are extensively used for various applications in industries.

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FAQ’s

What Is Clutch?

It is the most important part of the engine in an automobile. A clutch uses to transfer rotating motion or torque from one shaft to another shaft when requires. The torque developed by the engine at the initial speed is very low. Therefore it is impossible to start the engine under load.

Hence a device that use to engage and disengage the engine from the transmission system is called a clutch. It permits the gradual taking of load when adequately operated, thereby it prevents jerky motion of the vehicle, and this avoids undue strain on the parts of the vehicle as well as passengers.

What Is A Hydraulic Clutch?

A hydraulic clutch is a type of automotive clutch that uses hydraulic fluid instead of a cable to move the clutch plate. These clutches have a master cylinder attached to the clutch pedal, which carries the fluid inside the clutch lining with high pressure when the driver presses the clutch pedal to detach the clutch.

Is a hydraulic clutch better in a car?

The new gearbox can be too heavy to function by cable and may require a lot of effort and even take a long time to function. Hydraulic clutches are rapidly activated and as a result, gears change rapidly and easily. Hence, It would not be wrong to say that hydraulic clutches are good.

What causes a hydraulic clutch to fail?

Sudden failure is often accompanied by broken or loose clutch cables, linkable, or a failed hydraulic master. The slave is caused by cylinders. There may also be a leakage in the hydraulic line or even the disc can be contaminated with something like dirt or debris.

How do you check a hydraulic clutch?

How do you check a hydrant in the driver’s seat and step the clutch pedal a few times? When you press the pedal, it should run smoothly and rise upright each time. If you’re having difficulty moving the pedal with any consistency, clutch fluid levels are likely to be low. aulic clutch?

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If you liked the article then don’t forget to share it with your loved one. ❤️ Please comment below to give your valuable feedback, and follow me on Instagram to stay comment with me. 🙏

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